Cruz-González Gabriel, Pinos-Rodríguez Juan Manuel, Alonso-Díaz Miguel Ángel, Romero-Salas Dora, Vicente-Martínez Jorge Genaro, Fernández-Salas Agustin, Jarillo-Rodríguez Jesús, Castillo-Gallegos Epigmenio
Facultad de Medicina Veterinaria y Zootecnia, Universidad Veracruzana, Veracruz 91710, Mexico.
Centro de Enseñanza, Investigación y Extensión en Ganadería Tropical, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Km. 5.5 Carretera Federal Tlapacoyan-Martínez de la Torre, Martínez de la Torre 93600, Mexico.
Animals (Basel). 2023 Mar 2;13(5):915. doi: 10.3390/ani13050915.
Rotational grazing has been mentioned as a potential tool to reduce losses caused by high tick loads. This study aimed: (1) to evaluate the effect of three grazing modalities (rotational grazing with 30- and 45-day pasture rest and continuous grazing) on infestation in cattle, (2) to determine population dynamics of in cattle under the three grazing modalities mentioned in the humid tropics. The experiment was carried out from April 2021 to March 2022 and consisted of 3 treatments of grazing with pastures of African Stargrass of 2 ha each. T1 was continuous grazing (CG00), and T2 and T3 were rotational grazing with 30 (RG30) and 45 d of recovery (RG45), respectively. Thirty calves of 8-12 months of age were distributed to each treatment (n = 10). Every 14 days, ticks larger than 4.5 mm were counted on the animals. Concomitantly, temperature (°C), relative humidity (RH), and rainfall (RNFL) were recorded. Animals in the RG45 group had the lowest count of compared to the RG30 and CG00 groups; these results suggest that RG45 days of rest could be a potential tool to control in cattle. Yet, we also observed the highest population of ticks on the animals under rotational grazing with a 30-day pasture rest. A low tick infestation characterized rotational grazing at 45 days of rest throughout the experiment. The association between the degree of tick infestation by and the climatic variables was nil ( > 0.05).
轮牧被认为是一种减少因蜱虫负荷过高而造成损失的潜在手段。本研究旨在：（1）评估三种放牧方式（30天和45天休牧的轮牧以及连续放牧）对牛群蜱虫感染情况的影响，（2）确定在潮湿热带地区上述三种放牧方式下牛群中蜱虫的种群动态。实验于2021年4月至2022年3月进行，包括三种处理方式，每种处理方式使用2公顷非洲星草牧场进行放牧。T1为连续放牧（CG00），T2和T3分别为30天（RG30）和45天休牧（RG45）的轮牧。将30头8 - 12月龄的小牛分配到每种处理方式中（n = 10）。每14天对动物身上大于4.5毫米的蜱虫进行计数。同时记录温度（℃）、相对湿度（RH）和降雨量（RNFL）。与RG30和CG00组相比，RG45组动物身上蜱虫的计数最低；这些结果表明45天的休牧天数可能是控制牛群蜱虫的一种潜在手段。然而，我们还观察到在30天休牧的轮牧方式下动物身上的蜱虫数量最多。在整个实验过程中，45天休牧的轮牧方式表现为蜱虫感染率较低。蜱虫感染程度与气候变量之间的关联不显著（P > 0.05）。
